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11 May 2004 Photodissociation of ClN3 and quenching of NCl(a) at elevated temperatures
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Proceedings Volume 5334, Gas and Chemical Lasers, and Applications III; (2004)
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States
Measurements of NCl(a) kinetics are being carried out in support of the effort to develop an NCl(a) driven iodine laser. Photolysis of ClN3 has been used as a radical source in several previous kinetic studies, as this produces high yields of NCl(a). It had been assumed that NCl(a) was a primary photoproduct. Measurements made under collision-free conditions now indicate that NCl(a) is a minor product, and that Cl and N3 are produced with a branching fraction of 0.95. In the present study we show that NCl(a) is efficiently produced by secondary photochemical reactions when ClN3 is photolyzed at moderate pressures. The implications of this finding for kinetic studies that rely on photolytic NCl(a) generation are considered. The effect of temperature on NCl(a) quenching rate constants is being investigated because the NCl(a)/I laser operates at elevated temperatures (>400 K). Quenching by H2, HCl, Cl2, and O2 in the temperature range from 295-460 K has been examined in the present study.
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Scott P. Tinney, Jiande Han, and Michael C. Heaven "Photodissociation of ClN3 and quenching of NCl(a) at elevated temperatures", Proc. SPIE 5334, Gas and Chemical Lasers, and Applications III, (11 May 2004);


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